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Optical bistability and multistability via atomic coherence in the quasi-Λ-type atomic system

Science China(Physics,Mechanics & Astronomy) 2009年第4期52卷 524-528页

作者： CHEN AiXi WANG ZhiPing CHEN DeHai Department of Applied Physics East China Jiaotong UniversityNanchang 330013China

The steady-state optical bistability(OB) and optical multistability(OM) behavior in the quasi——type atomic system driven by a probe field and a coherent coupling field inside a unidirectional ring cavity are shown,and the effects of coupling-field detuning and coupling-field intensity on the OB and OM behavior are investigated. The transition from OB to OM or vice versa is found by varying the detuning of the coherent coupling field or by adjusting the intensity of the coupling field. The influence of the atomic cooperation parameter on the OM behavior is also discussed.

关键词： optical bistability detuning intensity multistability

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Mechanical analysis of low β 162.5 MHz taper HWR cavity

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强激光与粒子束 2016年第4期28卷 170-174页

作者：范培亮朱凤钟胡天翔全胜文刘克新北京大学重离子物理研究所北京 100871 中国工程物理研究院流体物理研究所四川绵阳 621900

Peking University is designing a superconducting taper-type half-wave resonator （HWR） withfrequency of 162.5 MHz and β of 0.09 for high current proton beam （about 100 mA） and deuteron beam （about50 mA） acceleration. For this kind of SRF cavity, mechanical analysis is important to predict the frequencyshift caused by the cavity deformation. ANSYS codes are used to analyse the frequency shift caused by heliumbath pressure and Lorentz force, and the tuning range. Simulation results show that this HWR cavity has pressure sensitivity as low as 31.1 Hz/kPa and Lorentz force detuning coefficient of --0.41 Hz/（MV · m ^-1）e. Thetuning range of the cavity is ±4 177 kHz which is wide enough for compensating the possible frequency *** mechanical property of the cavity permits the cavity＇s stable operation.

关键词： half-wave resonator tuning Lorentz force detuning helium pressure detuning

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Multiphysics Analysis for Thermal Management of a 3 MeV, 325 MHz Radio Frequency Quadrupole Accelerator for Indian Spallation Neutron Source

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Journal of Electromagnetic Analysis and Applications 2019年第5期11卷 55-78页

作者： N. K. Sharma C. P. Paul S. C. Joshi G. V. Kane A. Chaturvedi Raja Ramanna Centre for Advanced Technology Indore India Homi Bhabha National Institute Mumbai India

We present multiphysics design studies for thermal management of a 325 MHz 3 MeV Radio Frequency Quadrupole (RFQ) structure for the front end of 1 GeV proton linac for proposed Indian Spallation Neutron Source (ISNS). Physics design of RFQ for ISNS application has been carried out for 10% (maximum) duty factor. During high power operation of RFQ, RF-induced heating would result in temperature rise, thermal deformations and frequency shift of RFQ from designed values. Therefore thermal management is one of the important design considerations for RFQ development. During design studies, electromagnetic analysis of RFQ cavity is performed to compute RF induced heat fluxes on RFQ surfaces using SUPERFISH and ANSYS software. Simulated results for both codes were compared and found in well agreement. A water cooling scheme has been designed to absorb RF induced heat from RFQ structure. Cooling parameters are optimized by employing univariate search method optimization technique. An RF-Thermal-Structural-RF coupled multi-physics analysis methodology is developed to evaluate thermal induced frequency detuning of ISNS RFQ structure. Parametric studies are carried out to investigate the effect of cooling water temperatures on RFQ frequency. Based on analysis results, cooling water temperatures are varied to restore RFQ frequency to designed values. Thus, water cooling will not only remove heat from structure, but it will also be used for online control of resonating frequency during steady state operation of RFQ structure. Results of numerical studies carried out for thermal management of ISNS RFQ are presented in this paper.

关键词： Multiphysics RFQ ISNS ANSYS Electromagnetic Thermal Structural Water Cooling detuning

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High Repetition Rate Optical Pulse Generation Using a Rational Harmonic Mode-Locking Technique in a Fiber Ring Laser

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Chinese Journal of Lasers 2001年第1期 12-15页

作者： WEI Daoping LI Tangjun ZHAO Yucheng JIAN Shuisheng (Institute of Lightwave Technology, Northern Jiaotong University, Beijing 100044, China) Received March 9, 2000 Revised manuscript received June 12, 2000

By applying a small frequency detuning to the RF modulation frequency, pulse trains with repetition rates of integer multiples of the RF modulation frequency have been obtained in an actively mode locking fiber ring laser. Optical pulse trains with repetition rates of 20 GHz, 30 GHz and 40 GHz were generated respectively here. Furthermore, an interesting phenomenon of generation of pulse train with repetition rate half the modulation frequency was observed.

关键词： fiber lasers rational harmonic mode locking detuning

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